Valve-gear for steam-engines.



No. 827,428. Q PATENTEID'JIILY 31, 1906. .J. w.'11Av1s.

VALVE GEAR FOR STEAM ENGINES.

v .LPPLIU ATIOI FILED 831 119; 1905.

. MH/ENTOR Joan DAVIS WITNESSES:

ATTORNEYS fin: NORRIS PETERS 00., wxsmmnvu, m c.

J. w. DAVIS.

- PATENTBDJULY 31, 1906.

VALVE GEAR FOR STEAM menus;

urmoumxrnnn s ngm. 1o. 1oos.

F .-E :3 W I "Him.

a L a cm, WAsHlNGTON, n. c.

5' SHEEN-S12E11 11W MN I, Ill r INVENTOR JOHN W DAvls ATTORNEYS No- 827,428. PATENTED JULY 31, 19062 J J. w. DAVIS.

VALVE GEAR FOR STEAM ENGINES. V

APPLIOATION FILED SBPTJIQ, 1906.

5 SHEETS-33133514.

lllllil INVENTOR.

JQHI /WDAWS I 1 1 JOH *Zhbfftheh'Unitd States, and a resident of companyingldrewings, in h I "'Flgure lfis'inpart'a 'vertie'eilsection and in 7 improvementgetitafched;; FigJfZ isv a vertieal {cross-section on the fIineIZ 12 of Fig. 4, Fig.; 1 l3fis'essideelevation-oftheattaehnient; 4. a horizontal resection of the attachment.

Fig; l '5 "is a eentr'al vertical "longitudinal seic- FOlejy, Lin-the eounfty of Ri eh'land and State i {of Illinois,- hatte; invented a new "and Im-y:

. I- ma as; dflwhidh the renewi g m n-r1, ear Mytmm'lon 1 nr mp or d means for" Eefieeting instant movement. .offthe' slide, or

iQ- hr regfi ing l nf n eng ne; being adapted to "out off at 11 11 stroke, 'if' desired; tend the 1';isue1 eoeentrie mm or earn-rod and other;vdlve gearibeing dispensedwitfhIi Theldem s of'foons-truetion,"itarrvangerherit,

kand operaltionjere hereinafter described and l elai-nred, the-same, being-illustrated in the ac:

"15am:an elevati enpf a steaniaengine with my tion of the niain portions of the attachment,

same wor thezsamebei-ng meinlyfon the linefi 5 of ,Fig. I 1 '6 is a perspect'ive view of a slide- Valve forminga part-of the attaehment. Fig.

7 is e perspeetivewiew of the port drblodk to i the-afior'esdid slide valvejs'applied and on which-it reeiprocates. FigqSjisfa supple, mentajl'plet'e .adepteld to be seeure'd upon the he'd -plstte ofthe attachment; "Fi g..9 is aZ'perg speetive iew loflt'he bed-plate or base of the sattachment. "is ,a perspective View of the[valveshown inljigj 6 the jsanlebeing inverted. Fig/11is ;longitudinztlsection of; the" auxiliary 'pisto'nlf on 'piston5va1ve "employedwhile shifting'the slidevalve'of the engirie',;to ether 'Withi a; oylinder inwhi'oh the is ymd; 12 is; a perspective & viewio'f' the, said auxi hary' gpisiton, or piston xcaIVQ'a Ortion' being broken-.ofi to "show one Referring in the st insteneetoFigil, 3

, indicates the box or easingin'whioh theoper a etive fperts of' niy' attachment" are. inclosed, 3

the same being: supported upon 1a flateraili breekefi 1,, b0'1ted tothe head of the, engine-E ioylhrder '2, piston 3 1s arranged in saidi eylinderrandeonneoted by a rod with a oros's- 3 head 4,, Workingfl-i-n guides and connected manner. An ordinary, D slide rwailve' "5' is alve B; whichi is arranged in a suitab' 'e bone the" other end of the atfiliaryhPiston/(se -oo'rresponding stuffing-box 10; serves sim ly as agu'iderlod;

orleesing d 7. G and 1-0;) the same bein g fitted and"adapted to's lide upon a part Eq(see Figs; 2- 4,15, and" 1 UNITED A E P EN O E Q e. JOH nirt rrs, 0E1 Qmm ILLINOIS, AssieNoRoF ONE-FOURTH Y i :TENNYSON AND I o E=-; oUR1-H; To FRANCIS IDUNBAB,

iospecifieationrof Lettersrriatenfi 1 v mammar -31,1905. l imion'fileas itemb'er19',19os.fsagiemmz mdeje, v

withfthe orank of the sh-aft in awerm own t arranged in the steam-chest 161300 govern the e tdmission andexhaus'taof steam tohaaiid from g 3 the eyli-nder This valve 5 is eonneoted jthe rod 7 with the auxiliarypiston or; iston 6 7 i 9 'inthe bed or foundation 0 of my improved ettaohment. The said rod '7 slides'inaistufiing-bbx'llO, formingan' attaehmentoffthe fbox for-easing A', and a guide-rod 7* isattaehed to A Figs. 5,- 11, and;"12,) t hefsame working inta 7 the casing A, whic'h 'is a reeten flare-bilol g "block Provided with] orts.-

e valve,

175 "withfa crank 12'ofiadiock-sh-aft-1 3) w hieis V operatively connected byrods Witfhjt'he aforesaid cross-head 4 isothat the shaft rocked and the valve reciprocatedeorhe- 80 i erosshead. The eforesaid anodll works in ay ,stutHrig-box 15. Steam is .adnfitted to the. valve-chamber 16 pipe 17,: connecting r with the main steam-pipe l'7 1of-the engine.

5. e V 5 and 12,) which isadapted to "travel in e Ibore9'of thebed C, Fi 9, as 'beforiestsited} is" F reciprocated and Gus ioned by steam ady]. initted throughports in the hediCy-and being t I -'steam engine it v ofloviou's that the latter gi x; willybe-reoiproeated accordingly. I In othenfl words, the move'mentof theauxi'liei y'piston B regulates themovement. of. the =.engine'- x'- va'lveyatnd' thereby governs fihe latter. j The; auxiliary piston'is fin turn; governed 'initsfh movements by theyseddle slide-tcalvej 1),: 1 which governs adnfiss'ionlof steamtoend-ex -i hiustflof same-from portsintheiportedlor'ff chambered block 'E.-' The-said block .(see' too 3 Figs! 4 and 5") i's'providedwifhiend bores "18, 1 in which pistons-T9 :are adapted,toslide f-theI same being connected by rods 19- wifih r'ightengular levers 20', Whose inner endslerepive otally connected with a hand-lever 21; .thatis pi-yotedgon thefside of the:1c asing"A."f(See g spondin'g' ;to the; reeipro'eatory travel of the The auxiliary -eyl indrical piston B, (se'eFi 's.

rigidlyconneoted with the "D- LQiIVe 5 ofithe have longitudinal passages 25, (see Fig. 4,)

which allow free passage of steam from one ,end to the other, so that it is prevented from forming a cushion at either end which might prevent due movement of the pistons.

The auxiliary piston B is moved in either direction by pressure of steam applied 'betweenits ends and the adjacent heads of the bore 9 (see especially Fig. 5) where the piston .is ready to move to the right upon the admission of steam from the left-hand port 26. This port is indicated in Fi 9 as located close to the end of the bed and a corresponding inlet-port 26 is located at the other end. Exhaust-ports27 are arranged on op- .posite sides and at the center of the length of the bed-plate C, and they communicate with the lateral passages 28. Two L- shaped ports are arranged in pairs on opposite sides ofthe central. portion of the bed-,plate C, those on one side being indicated by numbers 29 and 30 and the corres onding ones on the opposite side by numera s 29 and 30*. All ,these ports communicate at their inner ends with thebore 9,in which the auxiliary piston B reciprocates, and the same are indicated in ,Fi 5. The ports or passages 29 29 are for ful stroke cushions, and 30 30 may be ,termed "cut-off cushion-ports. Upon the vfoundation C is applied a plate F, (see Fig. 8,)

the same being arranged between the upper portion of the casing A, and thus forming the bedupon which the block E directly rests, as indicated in Figs. 2 and 5. This plate has openings 26 26 at its respective ends, the same corresponding and being adapted to ,register with the steam-ports 26 and 26 of the foundation 0. Further, it has on one side ports 29 and 30, adapted to register with the ports 29 30 in foundation C, and on the opposite side it has similar ports 29 and 30, adapted. to register with the ports 29 jand 30 of the foundation C. As before inti- 5 5 ated, the base or bottom of the blockE (see -Figs. 5 and 7) rests upon the plate F. This ,pipe is provided with two long obtuse-angled- ,ports 31 and 31 (see Fig. 4) and also side ports Y32 and 32 communicating with the respective ports 31 31, connected with or traversing the piston-bores 18.

v The saddle-valve D, which slides on the ,block E, .is provided with ports as follows: As indicated in Figs. 4 and 10, two live-steam ports 33 and 33 are provided at diagonally with the opposite end of the same.

B is located.

opposite points, also live-steam ports 34 and 34 at points intermediate the ends, but not directly opposite each other. (See Fig. 6.) The valve is further provided with exhaustports 35, the same extending along the sides of the valve, having two sidepassages, as shown in Figs. 4 and 10. The auxiliary piston B is provided at a point between its middle and each of its ends with circumferential grooves 36 36*, (see Figs. 5 and 12,) and on eachside of said grooves and also at the ends of the piston packing 37 is suitably arranged. A groove 36 communicates by longitudinal ports 38 with one end of the valve, and the other groove 36 communicates by groove' sl 139 1e function of these ports 38 39 is to effect the cushioning of the piston or valve B, as will be presently explained. When lever 21 is thrown to the left and locked, as shown in Fig. 3, the cut-off pistons 19 (see Fig. 4) are thrown back, so that steam may enter either of the side ports which may be in communication with the said orts 32 or 32 of the block E. In Figs. 4 an 5,the saddle-valve D is in such a position that the mouths of the long ports 31 31 are closed, and its port 32 is in coincidence with the live-steam port 33 of the valve. Thus steam may pass from 33 through 32 and 18 into the long port 31, thence down through the port 26 in bedplate F, and through end port 26 of bed 0 into the bore 9, in which the auxiliary piston (See Fig. 5.) In consequence the auxiliary iston B is forced to travel to the right. t the same time steam enters the vertical port 34 in saddle-.valve D, and thus passes through orts 29 and 30 in plate F, also the cut-o and full-stroke ports 29 and 30 in bed C, (see Figs. 8,9, and 5;) but steam is held captive or prevented from entering either groove 36 or 36 in the piston B, since neither of the grooves is at first in register with the ports 29, 30, &c. When piston B moves far enough to the right to spring the left groove 36 into register with port 30 in the bed 0, steam asses through ports 39 in the piston B to t e right-hand end of the same, and thus cushions and arrests it at half stroke. Since the iston B is connected by the stem-guide with the slide-valve 5 of the en ine, (see Fig. 1,) it is manifest that the valve 5 will have the same movement as the piston, and since the latter is arrested at halfstroke the piston 5 will take such position as to govern the ports of the cylinder 2, so that during the remainder of the travel of the iston 32 steam will work expansively. ien the valve D completes its movement to the right, its port 33 will be coincident with the long port 31 of the block E and also with the full-stroke cushion-port 29 in plate F and the port 29 in bed C, (the coincident cut-ofi cushion-ports 30 and 30 in parts F 0 being shut ofi or closed at this juncture,) and so when the auxiliary piston B has been drivento the limit of its travela cushion-port thereinwill coincide with the full-cushion port 29 in bed 0, and thus steam -will ass to the farther end of the bore 9 in the ed 0, so as to cushion and stop the piston B. When the saddle-valve D reaches ap intWhere its elongated side ports 35 coincide with the ports 27 27 in lateF and the corr'espondin ports 27 in bed ,steam will lexhaust'from botli ends of the piston-cylinder; at the: same time. When the lever 21 is thrown to the opposite angle from thatlindi'c atedin Fig. 3, the cutofi istons 19 will be forced'inward or toward eac other, and thusclosethe ports 32 and 32 in block E, so-that steam cannot enter,

,and hence the valve D will pass on without movingtheauxiliary' piston B at" this time;

but whenthe valve G has completed itsfull travel its'side port: 33 will coincide with the mouth of the long full-stroke, port 31 and also full stroke cushion-port 29,. so that be out of register with any so in moved correspondingly, a

steamwill enterthe latter, butbe held captive therein, sinceithe"auxiliarypiston B will be then, in such'position that its rooves will the ports 29, &c.; but atthes'ame time steam .passes from the port 33 in valve Dthrough the'long port, and thus down through the end port 26 described myinvention, what j der, a piston reciprocating therein and a v slide-valve'governing ports for admission and exhaust of steam, of'an auxiliary piston connected with such valve, a, casing having a cylinder in which said piston reciprocates, the latter having circumferential. grooves and ports extending therethrough in opposite directions at the endsv of the piston for: admission and exhaust of steam at theends of the pistoncylindelya block arranged centrallyin the casing and provided with'end bores and short and long ports arranged'as dew scribed, cut-off pistons arranged in the bores of said pipe, means for. adjustingv tnem'for opening and closing said ports, and a saddlevalve I applied to and ada ted to slide upon the aforesaid block and block and vertica site sides of the valve and between the m1 dle' and ends of the same and-means connecting 2. The combination with slide-valve governing admission of steam by an auxiliary piston'connected' with the enitending' from its ends to points in the side thereof, a cylinder in which the piston recip- When the pis in the bloc described;

aviiig live-steam ports at diagonally opposite points which are adapted toregister with the ports of the ports arranged on 0 said valve with the piston" of the engine, whereby the valve is actuated, substantlally as described; I

der, a piston reciprocating therein and a gine-valve and having cushioning-ports exrocates, the same havingports for admission of steam at the ends and provided with coincident end ports andin-' termediatefports, a central block-arranged i upon the said plate and. having communicating' long and short portsand a saddle-valve operativelyconnected with the engine-piston register with cushioning-portsv in the aforeand having live-steam ports arranged diagoe nally opposite andzvertical ports adapted to said plate, substantiallyas described.

v3. In a cut-off-valve mechanism,the combihation'with an engine-valve, of a casin bore or cylinder, an auxiliary'piston adaptedv to slide'therein and'provided withlongitudi- I nal ports for passage of steam and for cushioning, suitable ports for admitting steam to 5 the ends. of the piston-cylindergand inter-- mediate thereof, a central block having ports connected with others in the bed, and a, saddle-valve operatively connected with the engine'and arranged slidably onthe'said pipe rob and havin orts communicatin with others 4. ,In a cut-off-valve mechanism, the combination with a central block having ports 105 for communicating with other ports in the bed, of a saddle-valve-adapted to slide on said block and having diagonally opposite ports adapted to be brought into and out of register with ports in the block, substantially 1 10 7 a as described, r, r v k r JoHNjw. DAV IS. Witnesses: v a I j MILTON A. HAUSER;

WILLIAM PAM. I L

an engine-cylin-; v

,intermediately thereof, and also exhaust-ports arranged-as described, aplatelarranged on the bed-andv s @9 3; v having a base provided with a longitudina andthe bed', substantially as Y 

